Company lists · Data verified August 2026

Top 25 Email marketing optimization firms based in the United Kingdom

Name: Email marketing optimization firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 416 companies tracked

There are 416 email marketing optimization firms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 9,961 professional contacts across them, including 502 with verified work emails and 1,696 with mobile numbers. London is the largest hub.

This list covers email marketing optimization firms headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

416Companies

9,961Contacts tracked

502Verified emails

1,696Mobile numbers

Unlock all 416 companies Free account · no credit card · 2 minutes

The 25 largest email marketing optimization firms based in the United Kingdom

Ranked by team size

Top 25 of 416 email marketing optimization firms based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Emailclub	London	51-200	103	39
2	Underground Ecom	London	51-200	103	21
3	1973 LTD	Chalgrove	11-50	72	5
4	Moosend	London	11-50	32	17
5	Folderly INC	London	51-200	29	11
6	Klicktipp	London	11-50	29	6
7	MHI Media	Bristol	51-200	25	14
8	TLC Business	Winchester	11-50	24	8
9	Hookflash	London	11-50	23	15
10	120feet	Whitchurch	11-50	21	13
11	Auraseed	Brighton	11-50	18	10
12	Open House Media	London	11-50	16	8
13	Campaigner	North Shields	51-200	16	6
14	Merrehill	Macclesfield	11-50	13	9
15	Jarrang	London	11-50	13	6
16	Brave Agency	Peterborough	11-50	12	6
17	Growth Savvy	London	11-50	12	4
18	Postman	London	11-50	11	6
19	Silk Email	Lostwithiel	11-50	11	3
20	Marketing Punch LTD	Quedgeley	11-50	10	6
21	Enviary	London	51-200	9	2
22	Marketing Town	London	51-200	9	1
23	C2o Media	Newmarket	11-50	8	6
24	Hive Marketing Cloud	Bristol	11-50	8	6
25	Mailxpertise	Ashford	11-50	8	6

Showing 25 of 416 email marketing optimization firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 502 reachable decision-makers.

Free account · no credit card

See all 416 companies

Email marketing optimization firms based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 154 HQs

1,696Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

321

11-50

51-200

201-500

501-1,000

Email marketing optimization firms by metro

Metro	Companies
Email marketing optimization firms in London	154
Email marketing optimization firms in Manchester	16
Email marketing optimization firms in Bristol	8
Email marketing optimization firms in Brighton	8
Email marketing optimization firms in Sheffield	7
Email marketing optimization firms in Glasgow	5
Email marketing optimization firms in Birmingham	4

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “email marketing optimization firms”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many email marketing optimization firms are there based in the United Kingdom?

There are 416 email marketing optimization firms headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Emailclub, headquartered in London, tops this list with the largest team on record.

Which city has the most email marketing optimization firms?

London leads with 154 headquartered companies, followed by Manchester (16) and Bristol (8).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 502 verified decision-maker contacts tracked across these 416 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

Ready to reach these companies? Verified emails and direct dials for all 416 email marketing optimization firms based in the United Kingdom. Start with a free account, no credit card.

Get the full list

Related lists

Email marketing optimization firms by geography

Browse the directory

Browse: Companies home · All United Kingdom lists · All Email marketing optimization firms lists · New lists

About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph, the same data that powers RevenueBase's B2B data products and the free research portal.